Vapor/vapor-solid interfacial growth of covalent organic framework membranes on alumina hollow fiber for advanced molecular separation
Vapor/vapor-solid interfacial growth of covalent organic framework membranes on alumina hollow fiber for advanced molecular separation
Covalent organic frameworks (COFs), known for their chemical stability and porous crystalline structure, hold promises as advanced separation membranes. However, fabricating high-quality COF membranes, particularly on industrial-preferred hollow fiber substrates, remains challenging. This study introduces a novel vapor/vapor-solid (V/V−S) method for growing ultrathin crystalline TpPa-1 COF membranes on the inner lumen surface of alumina hollow fibers (TpPa-1/Alumina). Through vapor-phase monomer introduction onto polydopamine-modified alumina at 170 °C and 1 atm, efficient polymerization and crystallization occur at the confined V−S interface. This enables one-step growth within 8 h, producing 100 nm thick COF membranes with strong substrate adhesion. TpPa-1/Alumina exhibits exceptional stability and performance over 80 h in continuous cross-flow organic solvent nanofiltration (OSN), with methanol permeance of about 200 L m−2 h−1 bar−1 and dye rejection with molecular weight cutoff (MWCO) of approximately 700 Da. Moreover, the versatile V/V−S method synthesizes two additional COF membranes (TpPa2Cl/Alumina and TpHz/Alumina) with different pore sizes and chemical environments. Adjusting the COF membrane thickness between 100–500 nm is achievable easily by varying the growth cycle numbers. Notably, TpPa2Cl/Alumina demonstrates excellent OSN performance in separating the model active pharmaceutical ingredient glycyrrhizic acid (GA) from dimethyl sulfoxide (DMSO), highlighting the method's potential for large-scale industrial applications.
alumina hollow fiber, covalent organic frameworks, loose nanofiltration, organic solvent nanofiltration, vapor/vapor-solid interfacial growth
Siow, Wei Jian Samuel
201631f9-883a-40ff-9eae-a69685895357
Chong, Jeng Yi
2f9ead94-86f2-4e20-9e67-75f10759555b
Ong, Jia Hui
8fcd78ea-21b0-4ef6-a5d4-bf5b2be2b80b
Kraft, Markus
0b4d3902-91df-4794-a4c4-ccc4901a40cd
Wang, Rong
1f58a88c-01ff-4941-857a-427ee8c8aa62
Xu, Rong
b8ecfd39-2f53-48e3-b672-e268c43f7db4
5 August 2024
Siow, Wei Jian Samuel
201631f9-883a-40ff-9eae-a69685895357
Chong, Jeng Yi
2f9ead94-86f2-4e20-9e67-75f10759555b
Ong, Jia Hui
8fcd78ea-21b0-4ef6-a5d4-bf5b2be2b80b
Kraft, Markus
0b4d3902-91df-4794-a4c4-ccc4901a40cd
Wang, Rong
1f58a88c-01ff-4941-857a-427ee8c8aa62
Xu, Rong
b8ecfd39-2f53-48e3-b672-e268c43f7db4
Siow, Wei Jian Samuel, Chong, Jeng Yi, Ong, Jia Hui, Kraft, Markus, Wang, Rong and Xu, Rong
(2024)
Vapor/vapor-solid interfacial growth of covalent organic framework membranes on alumina hollow fiber for advanced molecular separation.
Angewandte Chemie - International Edition, 63 (32), [e202406830].
(doi:10.1002/anie.202406830).
Abstract
Covalent organic frameworks (COFs), known for their chemical stability and porous crystalline structure, hold promises as advanced separation membranes. However, fabricating high-quality COF membranes, particularly on industrial-preferred hollow fiber substrates, remains challenging. This study introduces a novel vapor/vapor-solid (V/V−S) method for growing ultrathin crystalline TpPa-1 COF membranes on the inner lumen surface of alumina hollow fibers (TpPa-1/Alumina). Through vapor-phase monomer introduction onto polydopamine-modified alumina at 170 °C and 1 atm, efficient polymerization and crystallization occur at the confined V−S interface. This enables one-step growth within 8 h, producing 100 nm thick COF membranes with strong substrate adhesion. TpPa-1/Alumina exhibits exceptional stability and performance over 80 h in continuous cross-flow organic solvent nanofiltration (OSN), with methanol permeance of about 200 L m−2 h−1 bar−1 and dye rejection with molecular weight cutoff (MWCO) of approximately 700 Da. Moreover, the versatile V/V−S method synthesizes two additional COF membranes (TpPa2Cl/Alumina and TpHz/Alumina) with different pore sizes and chemical environments. Adjusting the COF membrane thickness between 100–500 nm is achievable easily by varying the growth cycle numbers. Notably, TpPa2Cl/Alumina demonstrates excellent OSN performance in separating the model active pharmaceutical ingredient glycyrrhizic acid (GA) from dimethyl sulfoxide (DMSO), highlighting the method's potential for large-scale industrial applications.
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More information
Accepted/In Press date: 10 April 2024
e-pub ahead of print date: 24 May 2024
Published date: 5 August 2024
Additional Information:
Publisher Copyright:
© 2024 Wiley-VCH GmbH.
Keywords:
alumina hollow fiber, covalent organic frameworks, loose nanofiltration, organic solvent nanofiltration, vapor/vapor-solid interfacial growth
Identifiers
Local EPrints ID: 493024
URI: http://eprints.soton.ac.uk/id/eprint/493024
ISSN: 1433-7851
PURE UUID: 24b7479e-4cda-4d63-b7ca-eaa007d6abf6
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Date deposited: 21 Aug 2024 17:19
Last modified: 22 Aug 2024 02:10
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Contributors
Author:
Wei Jian Samuel Siow
Author:
Jeng Yi Chong
Author:
Jia Hui Ong
Author:
Markus Kraft
Author:
Rong Wang
Author:
Rong Xu
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